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Good advice from all.
A few observations:
It's rare for a crossing bird to be at exactly a 90 degree angle, just as it's rare for a bird to be exactly 30 yards away, or 40 yards, etc. And it's rare for some birds (grouse, woodcock) to be flying at a consistent speed- they are often turning to go around something, so the speed varies.
What's that mean? Well, the advice to use the brain computer and forget numbers is good advice, IMO.
One observation after seeing a few birds killed (and missed) in the last 50 some years. . . very few birds are missed by leading them too much. Lots of birds get missed by not leading them enough.
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Jack@huntchat.com
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